Analysis

  • max time kernel
    211s
  • max time network
    215s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/02/2024, 15:46

General

  • Target

    RvcDownloader.exe

  • Size

    1.1MB

  • MD5

    7f6ce9a396cae9d375cb1a56de268b84

  • SHA1

    4129cc4492f057cc2ec78c195c1badd7ab3d9c65

  • SHA256

    604d490b9d5dfff01c9fceb085798c6b42f5778c9f125457be654dc4f436ab04

  • SHA512

    e3cfe5afbde8b7889767cd9556ddbff2a3652ab139f06f02ec27cbd638d05604b3cbd5dcc2732a62750ced77d32eeab69b92e7eca38fe434121611c8775c314d

  • SSDEEP

    24576:YAKoSJz+0Iw0kyFKLjA4OInTbghKT+5YqyIkIIWV+05rk4o/iq6MH:HCS7wDNjA4OIPiDGqyIkHfy0N

Malware Config

Signatures

  • njRAT/Bladabindi

    Widely used RAT written in .NET.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops startup file 2 IoCs
  • Executes dropped EXE 4 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 27 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: GetForegroundWindowSpam 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 43 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SetWindowsHookEx 5 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe
    "C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:4080
    • C:\Users\Admin\AppData\Local\Temp\Dllhost.exe
      "C:\Users\Admin\AppData\Local\Temp\Dllhost.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4844
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /sc minute /mo 1 /tn Server /tr C:\Users\Admin\AppData\Local\Temp/Server.exe
        3⤵
        • Creates scheduled task(s)
        PID:1400
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:3988
    • C:\Users\Admin\AppData\Local\Temp\Server.exe
      C:\Users\Admin\AppData\Local\Temp/Server.exe
      1⤵
      • Executes dropped EXE
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of SetWindowsHookEx
      PID:1504
    • C:\Users\Admin\AppData\Local\Temp\Server.exe
      C:\Users\Admin\AppData\Local\Temp/Server.exe
      1⤵
      • Executes dropped EXE
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of SetWindowsHookEx
      PID:2952
    • C:\Users\Admin\AppData\Local\Temp\Server.exe
      C:\Users\Admin\AppData\Local\Temp/Server.exe
      1⤵
      • Executes dropped EXE
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of SetWindowsHookEx
      PID:1652

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Server.exe.log

            Filesize

            507B

            MD5

            25d1b50e7c0d451f3d850eb54d27ca05

            SHA1

            a238807715c70a335f54e80d4855644b21a9e870

            SHA256

            650faa13e983c9046c9030f63a5fa1c33900432ec7cb3762e015da2e7c5b34a5

            SHA512

            4223a26b2fabefdf1c01443ccc7bd887464d27f02694379895a040c66db472d541218d501f1c01e1bd31012d079a31baf24e20882c32cf652a09a74e3bf385f5

          • C:\Users\Admin\AppData\Local\Temp\Dllhost.exe

            Filesize

            1.1MB

            MD5

            7f6ce9a396cae9d375cb1a56de268b84

            SHA1

            4129cc4492f057cc2ec78c195c1badd7ab3d9c65

            SHA256

            604d490b9d5dfff01c9fceb085798c6b42f5778c9f125457be654dc4f436ab04

            SHA512

            e3cfe5afbde8b7889767cd9556ddbff2a3652ab139f06f02ec27cbd638d05604b3cbd5dcc2732a62750ced77d32eeab69b92e7eca38fe434121611c8775c314d

          • memory/1504-42-0x0000000074650000-0x0000000074E00000-memory.dmp

            Filesize

            7.7MB

          • memory/1504-43-0x0000000000880000-0x0000000000BF4000-memory.dmp

            Filesize

            3.5MB

          • memory/1504-40-0x0000000000880000-0x0000000000BF4000-memory.dmp

            Filesize

            3.5MB

          • memory/1504-44-0x0000000005E10000-0x0000000005E20000-memory.dmp

            Filesize

            64KB

          • memory/1504-48-0x0000000000880000-0x0000000000BF4000-memory.dmp

            Filesize

            3.5MB

          • memory/1504-49-0x0000000074650000-0x0000000074E00000-memory.dmp

            Filesize

            7.7MB

          • memory/1652-79-0x00000000035E0000-0x00000000035F0000-memory.dmp

            Filesize

            64KB

          • memory/1652-76-0x0000000000880000-0x0000000000BF4000-memory.dmp

            Filesize

            3.5MB

          • memory/1652-77-0x0000000074650000-0x0000000074E00000-memory.dmp

            Filesize

            7.7MB

          • memory/1652-78-0x0000000000880000-0x0000000000BF4000-memory.dmp

            Filesize

            3.5MB

          • memory/1652-81-0x0000000000880000-0x0000000000BF4000-memory.dmp

            Filesize

            3.5MB

          • memory/1652-82-0x0000000074650000-0x0000000074E00000-memory.dmp

            Filesize

            7.7MB

          • memory/2952-62-0x0000000000880000-0x0000000000BF4000-memory.dmp

            Filesize

            3.5MB

          • memory/2952-66-0x0000000074650000-0x0000000074E00000-memory.dmp

            Filesize

            7.7MB

          • memory/2952-57-0x0000000000880000-0x0000000000BF4000-memory.dmp

            Filesize

            3.5MB

          • memory/2952-63-0x0000000005740000-0x0000000005750000-memory.dmp

            Filesize

            64KB

          • memory/2952-60-0x0000000074650000-0x0000000074E00000-memory.dmp

            Filesize

            7.7MB

          • memory/2952-65-0x0000000000880000-0x0000000000BF4000-memory.dmp

            Filesize

            3.5MB

          • memory/4080-3-0x0000000004050000-0x00000000040EC000-memory.dmp

            Filesize

            624KB

          • memory/4080-6-0x0000000006600000-0x0000000006692000-memory.dmp

            Filesize

            584KB

          • memory/4080-5-0x0000000006BB0000-0x0000000007154000-memory.dmp

            Filesize

            5.6MB

          • memory/4080-4-0x00000000064F0000-0x0000000006500000-memory.dmp

            Filesize

            64KB

          • memory/4080-2-0x0000000000D10000-0x0000000001084000-memory.dmp

            Filesize

            3.5MB

          • memory/4080-20-0x0000000000D10000-0x0000000001084000-memory.dmp

            Filesize

            3.5MB

          • memory/4080-19-0x0000000074650000-0x0000000074E00000-memory.dmp

            Filesize

            7.7MB

          • memory/4080-0-0x0000000000D10000-0x0000000001084000-memory.dmp

            Filesize

            3.5MB

          • memory/4080-1-0x0000000074650000-0x0000000074E00000-memory.dmp

            Filesize

            7.7MB

          • memory/4844-23-0x0000000005D40000-0x0000000005D50000-memory.dmp

            Filesize

            64KB

          • memory/4844-28-0x0000000006340000-0x00000000063A6000-memory.dmp

            Filesize

            408KB

          • memory/4844-58-0x0000000005D40000-0x0000000005D50000-memory.dmp

            Filesize

            64KB

          • memory/4844-16-0x0000000000AF0000-0x0000000000E64000-memory.dmp

            Filesize

            3.5MB

          • memory/4844-54-0x000000002F2A0000-0x000000002F2AC000-memory.dmp

            Filesize

            48KB

          • memory/4844-21-0x0000000000AF0000-0x0000000000E64000-memory.dmp

            Filesize

            3.5MB

          • memory/4844-22-0x0000000074650000-0x0000000074E00000-memory.dmp

            Filesize

            7.7MB

          • memory/4844-59-0x0000000005D40000-0x0000000005D50000-memory.dmp

            Filesize

            64KB

          • memory/4844-69-0x0000000005D40000-0x0000000005D50000-memory.dmp

            Filesize

            64KB

          • memory/4844-71-0x0000000005D40000-0x0000000005D50000-memory.dmp

            Filesize

            64KB

          • memory/4844-27-0x0000000006110000-0x000000000611A000-memory.dmp

            Filesize

            40KB

          • memory/4844-35-0x0000000007330000-0x000000000733A000-memory.dmp

            Filesize

            40KB

          • memory/4844-33-0x0000000005D40000-0x0000000005D50000-memory.dmp

            Filesize

            64KB

          • memory/4844-32-0x0000000074650000-0x0000000074E00000-memory.dmp

            Filesize

            7.7MB

          • memory/4844-31-0x0000000007230000-0x0000000007248000-memory.dmp

            Filesize

            96KB

          • memory/4844-30-0x0000000000AF0000-0x0000000000E64000-memory.dmp

            Filesize

            3.5MB